I first noticed this in Overwatch (OW) but also with Diablo 3. These are the only games I play online. OW has a inbuilt tool to look at it's network connection. It shows … (read more)

I first noticed this in Overwatch (OW) but also with Diablo 3. These are the only games I play online. OW has a inbuilt tool to look at it's network connection. It shows that about every 5 secs, ping spikes. There might be other stuff happening, like some loss, but I can't say for sure. This translates into choppy gameplay which is unbearable for online FPS. If you look at the attached image, you see that the spikes go to 128 ms. I normally run 44 ms.

This symptom does not start immediately and I haven't been able to check how long it takes to start. It does go away if I close firefox down.

I tried to:
- remove all addons
- close tabs until only home/empty tab was left
- removing/reinstalling firefox.

Nothing really worked.

I am running the latest version of Windows 10 (1803) with the latest version of Firefox 63.0.3. All 64bit.